Production of aromatic diamino compounds using a modified...

Details Production of aromatic diamino compounds using a modified... Production of aromatic diamino compounds using a modified...

C - Chemistry, Metallurgy

07

C

260/598.4

C07C 209/36 (2006.01) B01J 25/00 (2006.01)

Patent

CA 1260014

PRODUCTION OF AROMATIC DIAMINO COMPOUNDS USING A MODIFIED RANEY CATALYST ABSTRACT OF THE DISCLOSURE Aromatic diamino compounds are produced by hydrogenating the corresponding dinitro compounds in the presence of a modified Raney catalyst. The modified Raney catalyst is obtained by treating an alloy made up of 50-95 wt % of aluminum, 4-45 wt % nickel and/or cobalt and 1-46 wt % of at least one modifying metal with an alkali material. The modifying metal is selected from the metals of the first, fourth, fifth, sixth, seventh and eighth subgroups of the Periodic Table of Elements. The hydrogenation is preferably carried out at from 170 to 250°C and a pressure of 15-50 bar. The heat generated during hydrogenation is pre- ferably used to produce steam.

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